Touch sensor panel including resistors for improved input signal

ABSTRACT

In some examples, a touch screen includes resistors between the touch electrodes and routing traces. In some examples, the resistors can include a transparent conductive material included in the touch electrodes of the touch screen. The resistors can be located in a border region of the touch screen that can surround an active area of the touch screen that can include the touch electrodes and display pixels of the touch screen, for example. In some examples, the resistors included in the touch screen can have different resistances from each other and the same outer dimensions as one another. The resistors can reduce the variation in resistance from channel to channel in the touch screen, which can improve touch screen performance, for example.

FIELD OF THE DISCLOSURE

This relates generally to a touch screen and, more specifically, to atouch screen that includes resistors between the touch electrodes androuting traces.

BACKGROUND OF THE DISCLOSURE

Many types of input devices are presently available for performingoperations in a computing system, such as buttons or keys, mice,trackballs, joysticks, touch sensor panels, touch screens and the like.Touch screens, in particular, are popular because of their ease andversatility of operation as well as their declining price. Touch screenscan include a touch sensor panel, which can be a clear panel with atouch-sensitive surface, and a display device such as a liquid crystaldisplay (LCD), light emitting diode (LED) display or organic lightemitting diode (OLED) display that can be positioned partially or fullybehind the panel so that the touch-sensitive surface can cover at leasta portion of the viewable area of the display device. Touch screens canallow a user to perform various functions by touching the touch sensorpanel using a finger, stylus or other object at a location oftendictated by a user interface (UI) being displayed by the display device.In general, touch screens can recognize a touch and the position of thetouch on the touch sensor panel, and the computing system can theninterpret the touch in accordance with the display appearing at the timeof the touch, and thereafter can perform one or more actions based onthe touch. In the case of some touch sensing systems, a physical touchon the display is not needed to detect a touch. For example, in somecapacitive-type touch sensing systems, fringing electrical fields usedto detect touch can extend beyond the surface of the display, andobjects approaching near the surface may be detected near the surfacewithout actually touching the surface.

Capacitive touch sensor panels can be formed by a matrix of transparent,semi-transparent or non-transparent conductive plates made of materialssuch as Indium Tin Oxide (ITO). In some examples, the conductive platescan be formed from other materials including conductive polymers, metalmesh, graphene, nanowires (e.g., silver nanowires) or nanotubes (e.g.,carbon nanotubes). In some implementations, due in part to theirsubstantial transparency, some capacitive touch sensor panels can beoverlaid on a display to form a touch screen, as described above. Sometouch screens can be formed by at least partially integrating touchsensing circuitry into a display pixel stackup (i.e., the stackedmaterial layers forming the display pixels).

In some examples, touch electrodes can be coupled to touch circuitry byconductive traces. The conductive traces included in the touch sensorpanels can have different lengths and, thus, different resistances, insome examples. In some examples, the resistances of the conductivetraces can impact the touch signals sensed at the touch sensor panels.For example, variations in resistance of the conductive traces can causeerrors in touch sensing that, in turn, can cause errors in locating aproximate object, determining whether a proximate object is touching orhovering over the surface of the touch sensor panel, and/or errors intracking the movement of an object while it is in contact with thesurface of the touch sensor panel.

BRIEF SUMMARY OF THE DISCLOSURE

This relates generally to a touch screen and, more specifically, to atouch screen that includes resistors between the touch electrodes androuting traces. In some examples, routing traces can have differentlengths and, therefore, different resistances from one another.Including resistors coupled between the routing traces and touchelectrodes can reduce the differences in resistance of each channel, forexample. In some examples, reducing the differences in resistance ofeach channel can improve detecting of an input device. For example,reducing the differences in resistance of each channel can equalize thethreshold to which touch data is compared to determine whether the inputdevice is in contact with the touch screen or not and improve theaccuracy with which the location of the input device is detected andreduce phantom “wobble” in the detected location of the input devicecaused by inaccuracies in locating the input device.

In some examples, the resistors can include a transparent conductivematerial included in the touch electrodes of the touch screen. Theresistors can be located in a border region of the touch screen that cansurround an active area of the touch screen that can include the touchelectrodes and display pixels of the touch screen, for example. In someexamples, the resistors included in the touch screen can have differentresistances from each other and the same outer dimensions as oneanother. For example, the resistors can include holes surrounded by theconductive material of the resistors. In some examples, differentresistors can have different sized holes and the same outer dimensions.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A-1E illustrate example systems that can use resistancetechniques according to examples of the disclosure.

FIG. 2 illustrates an example computing system including a touch screenthat can use resistance techniques according to examples of thedisclosure.

FIG. 3A illustrates an exemplary touch sensor circuit corresponding to aself-capacitance measurement of a touch node electrode and sensingcircuit according to examples of the disclosure.

FIG. 3B illustrates an exemplary touch sensor circuit corresponding to amutual-capacitance drive line and sense line and sensing circuitaccording to examples of the disclosure.

FIG. 4A illustrates touch screen with touch electrodes arranged in rowsand columns according to examples of the disclosure.

FIG. 4B illustrates touch screen with touch node electrodes arranged ina pixelated touch node electrode configuration according to examples ofthe disclosure.

FIG. 5 illustrates an exemplary touch screen according to some examplesof the disclosure.

FIG. 6 is a chart illustrating exemplary differences in touch sensingthat can be caused by variations in resistances of opaque conductivetraces of touch screens according to some examples.

FIG. 7 illustrates an exemplary touch screen including resistors coupledto the opaque conductive traces that connect touch electrodes to thebond pads according to some examples of the disclosure.

FIGS. 8A-8B illustrate an exemplary resistor according to some examplesof the disclosure.

FIG. 9 illustrates exemplary resistors according to some examples of thedisclosure.

DETAILED DESCRIPTION OF THE DISCLOSURE

In the following description of examples, reference is made to theaccompanying drawings which form a part hereof, and in which it is shownby way of illustration specific examples that can be practiced. It is tobe understood that other examples can be used and structural changes canbe made without departing from the scope of the disclosed examples.

This relates generally to a touch screen and, more specifically, to atouch screen that includes resistors between the touch electrodes androuting traces. In some examples, routing traces can have differentlengths and, therefore, different resistances from one another.Including resistors coupled between the routing traces and touchelectrodes can reduce the differences in resistance of each channel, forexample. In some examples, reducing the differences in resistance ofeach channel can improve detecting of an input device. For example,reducing the differences in resistance of each channel can equalize thethreshold to which touch data is compared to determine whether the inputdevice is in contact with the touch screen or not and improve theaccuracy with which the location of the input device is detected andreduce phantom “wobble” in the detected location of the input devicecaused by inaccuracies in locating the input device.

In some examples, the resistors can include a transparent conductivematerial included in the touch electrodes of the touch screen. Theresistors can be located in a border region of the touch screen that cansurround an active area of the touch screen that can include the touchelectrodes and display pixels of the touch screen, for example. In someexamples, the resistors included in the touch screen can have differentresistances from each other and the same outer dimensions as oneanother. For example, the resistors can include holes surrounded by theconductive material of the resistors. In some examples, differentresistors can have different sized holes and the same outer dimensions.

FIGS. 1A-1E illustrate example systems that can use resistancetechniques according to examples of the disclosure. FIG. 1A illustratesan example mobile telephone 136 that includes a touch screen 124 thatcan use resistance techniques according to examples of the disclosure.FIG. 1B illustrates an example digital media player 140 that includes atouch screen 126 that can use resistance techniques according toexamples of the disclosure. FIG. 1C illustrates an example personalcomputer 144 that includes a touch screen 128 and a touch sensor panel134 (e.g., a trackpad) that can use resistance techniques according toexamples of the disclosure. FIG. 1D illustrates an example tabletcomputing device 148 that includes a touch screen 130 that can useresistance techniques according to examples of the disclosure. FIG. 1Eillustrates an example wearable device 150 that includes a touch screen132 and can be attached to a user using a strap 152 and that can useresistance techniques according to examples of the disclosure. It isunderstood that a touch screen and resistance techniques can beimplemented in other devices, including future devices not yet in themarketplace. Additionally, it should be understood that although thedisclosure herein primarily focuses on touch screens, the disclosure ofnoise removal techniques can be implemented for devices including touchsensor panels (and displays) that may not be implemented as a touchscreen.

In some examples, touch screens 124, 126, 128, 130 and 132 and touchsensor panels 134 and 138 can be based on self-capacitance. Aself-capacitance based touch system can include a matrix of small,individual plates of conductive material or groups of individual platesof conductive material forming larger conductive regions that can bereferred to as touch electrodes or as touch node electrodes (asdescribed below with reference to FIG. 4B). For example, a touch screencan include a plurality of individual touch electrodes, each touchelectrode identifying or representing a unique location (e.g., a touchnode) on the touch screen at which touch or proximity is to be sensed,and each touch node electrode being electrically isolated from the othertouch node electrodes in the touch screen/panel. Such a touch screen canbe referred to as a pixelated self-capacitance touch screen, though itis understood that in some examples, the touch node electrodes on thetouch screen can be used to perform scans other than self-capacitancescans on the touch screen (e.g., mutual capacitance scans). Duringoperation, a touch node electrode can be stimulated with an alternatingcurrent (AC) waveform, and the self-capacitance to ground of the touchnode electrode can be measured. As an object approaches the touch nodeelectrode, the self-capacitance to ground of the touch node electrodecan change (e.g., increase). This change in the self-capacitance of thetouch node electrode can be detected and measured by the touch sensingsystem to determine the positions of multiple objects when they touch,or come in proximity to, the touch screen. In some examples, the touchnode electrodes of a self-capacitance based touch system can be formedfrom rows and columns of conductive material, and changes in theself-capacitance to ground of the rows and columns can be detected,similar to above. In some examples, a touch screen can be multi-touch,single touch, projection scan, full-imaging multi-touch, capacitivetouch, etc.

In some examples, touch screens 124, 126, 128, 130 and 132 and touchsensor panels 134 and 138 can be based on mutual capacitance. A mutualcapacitance based touch system can include electrodes arranged as driveand sense lines (e.g., as described below with reference to FIG. 4A)that may cross over each other on different layers (in a double-sidedconfiguration) or may be adjacent to each other on the same layer. Thecrossing or adjacent locations can form touch nodes. During operation,the drive line can be stimulated with an AC waveform and the mutualcapacitance of the touch node can be measured. As an object approachesthe touch node, the mutual capacitance of the touch node can change(e.g., decrease). This change in the mutual capacitance of the touchnode can be detected and measured by the touch sensing system todetermine the positions of multiple objects when they touch, or come inproximity to, the touch screen. As described herein, in some examples, amutual capacitance based touch system can form touch nodes from a matrixof small, individual plates of conductive material.

In some examples, touch screens 124, 126, 128, 130 and 132 and touchsensor panels 134 and 138 can be based on mutual capacitance and/orself-capacitance. The electrodes can be arrange as a matrix of small,individual plates of conductive material (e.g., as in touch nodeelectrodes 408 in touch screen 402 in FIG. 4B) or as drive lines andsense lines (e.g., as in row touch electrodes 404 and column touchelectrodes 406 in touch screen 400 in FIG. 4A), or in another pattern.The electrodes can be configurable for mutual capacitance orself-capacitance sensing or a combination of mutual and self-capacitancesensing. For example, in one mode of operation electrodes can beconfigured to sense mutual capacitance between electrodes and in adifferent mode of operation electrodes can be configured to senseself-capacitance of electrodes. In some examples, some of the electrodescan be configured to sense mutual capacitance there between and some ofthe electrodes can be configured to sense self-capacitance thereof.

FIG. 2 illustrates an example computing system including a touch screenthat can use noise removal techniques according to examples of thedisclosure. Computing system 200 can be included in, for example, amobile phone, tablet, touchpad, portable or desktop computer, portablemedia player, wearable device or any mobile or non-mobile computingdevice that includes a touch screen or touch sensor panel. Computingsystem 200 can include a touch sensing system including one or moretouch processors 202, peripherals 204, a touch controller 206, and touchsensing circuitry (described in more detail below). Peripherals 204 caninclude, but are not limited to, random access memory (RAM) or othertypes of memory or storage, watchdog timers, co-processor(s) and thelike. Touch controller 206 can include, but is not limited to, one ormore sense channels 208, channel scan logic 210 and driver logic 214.Channel scan logic 210 can access RAM 212, autonomously read data fromthe sense channels and provide control for the sense channels. Inaddition, channel scan logic 210 can control driver logic 214 togenerate stimulation signals 216 at various frequencies and/or phasesthat can be selectively applied to drive regions of the touch sensingcircuitry of touch screen 220, as described in more detail below. Insome examples, touch controller 206, touch processor 202 and peripherals204 can be integrated into a single application specific integratedcircuit (ASIC), and in some examples can be integrated with touch screen220 itself.

It should be apparent that the architecture shown in FIG. 2 is only oneexample architecture of computing system 200, and that the system couldhave more or fewer components than shown, or a different configurationof components. The various components shown in FIG. 2 can be implementedin hardware, software, firmware or any combination thereof, includingone or more signal processing and/or application specific integratedcircuits.

Computing system 200 can include a host processor 228 for receivingoutputs from touch processor 202 and performing actions based on theoutputs. For example, host processor 228 can be connected to programstorage 232 and a display controller/driver 234 (e.g., a Liquid-CrystalDisplay (LCD) driver). It is understood that although some examples ofthe disclosure may described with reference to LCD displays, the scopeof the disclosure is not so limited and can extend to other types ofdisplays, such as Light-Emitting Diode (LED) displays, including OrganicLED (OLED), Active-Matrix Organic LED (AMOLED) and Passive-MatrixOrganic LED (PMOLED) displays. Display driver 234 can provide voltageson select (e.g., gate) lines to each pixel transistor and can providedata signals along data lines to these same transistors to control thepixel display image.

Host processor 228 can use display driver 234 to generate a displayimage on touch screen 220, such as a display image of a user interface(UI), and can use touch processor 202 and touch controller 206 to detecta touch on or near touch screen 220, such as a touch input to thedisplayed UI. The touch input can be used by computer programs stored inprogram storage 232 to perform actions that can include, but are notlimited to, moving an object such as a cursor or pointer, scrolling orpanning, adjusting control settings, opening a file or document, viewinga menu, making a selection, executing instructions, operating aperipheral device connected to the host device, answering a telephonecall, placing a telephone call, terminating a telephone call, changingthe volume or audio settings, storing information related to telephonecommunications such as addresses, frequently dialed numbers, receivedcalls, missed calls, logging onto a computer or a computer network,permitting authorized individuals access to restricted areas of thecomputer or computer network, loading a user profile associated with auser's preferred arrangement of the computer desktop, permitting accessto web content, launching a particular program, encrypting or decoding amessage, capturing an image with a camera in communication with theelectronic device, exiting an idle/sleep state of the electronic device,and/or the like. Host processor 228 can also perform additionalfunctions that may not be related to touch processing.

Note that one or more of the functions described herein, including theconfiguration of switches, can be performed by firmware stored in memory(e.g., one of the peripherals 204 in FIG. 2) and executed by touchprocessor 202, or stored in program storage 232 and executed by hostprocessor 228. The firmware can also be stored and/or transported withinany non-transitory computer-readable storage medium for use by or inconnection with an instruction execution system, apparatus, or device,such as a computer-based system, processor-containing system, or othersystem that can fetch the instructions from the instruction executionsystem, apparatus, or device and execute the instructions. In thecontext of this document, a “non-transitory computer-readable storagemedium” can be any medium (excluding signals) that can contain or storethe program for use by or in connection with the instruction executionsystem, apparatus, or device. In some examples, RAM 212 or programstorage 232 (or both) can be a non-transitory computer readable storagemedium. One or both of RAM 212 and program storage 232 can have storedtherein instructions, which when executed by touch processor 202 or hostprocessor 228 or both, can cause the device including computing system200 to perform one or more functions and methods of one or more examplesof this disclosure. The computer-readable storage medium can include,but is not limited to, an electronic, magnetic, optical,electromagnetic, infrared, or semiconductor system, apparatus or device,a portable computer diskette (magnetic), a random access memory (RAM)(magnetic), a read-only memory (ROM) (magnetic), an erasableprogrammable read-only memory (EPROM) (magnetic), a portable opticaldisc such a CD, CD-R, CD-RW, DVD, DVD-R, or DVD-RW, or flash memory suchas compact flash cards, secured digital cards, USB memory devices,memory sticks, and the like.

The firmware can also be propagated within any transport medium for useby or in connection with an instruction execution system, apparatus, ordevice, such as a computer-based system, processor-containing system, orother system that can fetch the instructions from the instructionexecution system, apparatus, or device and execute the instructions. Inthe context of this document, a “transport medium” can be any mediumthat can communicate, propagate or transport the program for use by orin connection with the instruction execution system, apparatus, ordevice. The transport medium can include, but is not limited to, anelectronic, magnetic, optical, electromagnetic or infrared wired orwireless propagation medium.

Touch screen 220 can be used to derive touch information at multiplediscrete locations of the touch screen, referred to herein as touchnodes. Touch screen 220 can include touch sensing circuitry that caninclude a capacitive sensing medium having a plurality of drive lines222 and a plurality of sense lines 223. It should be noted that the term“lines” is sometimes used herein to mean simply conductive pathways, asone skilled in the art will readily understand, and is not limited toelements that are strictly linear, but includes pathways that changedirection, and includes pathways of different size, shape, materials,etc. Drive lines 222 can be driven by stimulation signals 216 fromdriver logic 214 through a drive interface 224 and resulting sensesignals 217 generated in sense lines 223 can be transmitted through asense interface 225 to sense channels 208 in touch controller 206. Inthis way, drive lines and sense lines can be part of the touch sensingcircuitry that can interact to form capacitive sensing nodes, which canbe thought of as touch picture elements (touch pixels) and referred toherein as touch nodes, such as touch nodes 226 and 227. This way ofunderstanding can be particularly useful when touch screen 220 is viewedas capturing an “image” of touch (“touch image”). In other words, aftertouch controller 206 has determined whether a touch has been detected ateach touch nodes in the touch screen, the pattern of touch nodes in thetouch screen at which a touch occurred can be thought of as an “image”of touch (e.g., a pattern of fingers touching the touch screen). As usedherein, an electrical component “coupled to” or “connected to” anotherelectrical component encompasses a direct or indirect connectionproviding electrical path for communication or operation between thecoupled components. Thus, for example, drive lines 222 may be directlyconnected to driver logic 214 or indirectly connected to drive logic 214via drive interface 224 and sense lines 223 may be directly connected tosense channels 208 or indirectly connected to sense channels 208 viasense interface 225. In either case an electrical path for drivingand/or sensing the touch nodes can be provided.

FIG. 3A illustrates an exemplary touch sensor circuit 300 correspondingto a self-capacitance measurement of a touch node electrode 302 andsensing circuit 314 (e.g., corresponding to a sense channel 208)according to examples of the disclosure. Touch node electrode 302 cancorrespond to a touch electrode 404 or 406 of touch screen 400 or atouch node electrode 408 of touch screen 402. Touch node electrode 302can have an inherent self-capacitance to ground associated with it, andalso an additional self-capacitance to ground that is formed when anobject, such as finger 305, is in proximity to or touching theelectrode. The total self-capacitance to ground of touch node electrode302 can be illustrated as capacitance 304. Touch node electrode 302 canbe coupled to sensing circuit 314. Sensing circuit 314 can include anoperational amplifier 308, feedback resistor 312 and feedback capacitor310, although other configurations can be employed. For example,feedback resistor 312 can be replaced by a switched capacitor resistorin order to minimize a parasitic capacitance effect that can be causedby a variable feedback resistor. Touch node electrode 302 can be coupledto the inverting input (−) of operational amplifier 308. An AC voltagesource 306 (V_(ac)) can be coupled to the non-inverting input (+) ofoperational amplifier 308. Touch sensor circuit 300 can be configured tosense changes (e.g., increases) in the total self-capacitance 304 of thetouch node electrode 302 induced by a finger or object either touchingor in proximity to the touch sensor panel. Output 320 can be used by aprocessor to determine the presence of a proximity or touch event, orthe output can be inputted into a discreet logic network to determinethe presence of a proximity or touch event.

FIG. 3B illustrates an exemplary touch sensor circuit 350 correspondingto a mutual-capacitance drive line 322 and sense line 326 and sensingcircuit 314 (e.g., corresponding to a sense channel 208) according toexamples of the disclosure. Drive line 322 can be stimulated bystimulation signal 306 (e.g., an AC voltage signal). Stimulation signal306 can be capacitively coupled to sense line 326 through mutualcapacitance 324 between drive line 322 and the sense line. When a fingeror object 305 approaches the touch node created by the intersection ofdrive line 322 and sense line 326, mutual capacitance 324 can change(e.g., decrease). This change in mutual capacitance 324 can be detectedto indicate a touch or proximity event at the touch node, as describedherein. The sense signal coupled onto sense line 326 can be received bysensing circuit 314. Sensing circuit 314 can include operationalamplifier 308 and at least one of a feedback resistor 312 and a feedbackcapacitor 310. FIG. 3B illustrates a general case in which bothresistive and capacitive feedback elements are utilized. The sensesignal (referred to as V_(in)) can be inputted into the inverting inputof operational amplifier 308, and the non-inverting input of theoperational amplifier can be coupled to a reference voltage V_(ref).Operational amplifier 308 can drive its output to voltage V_(o) to keepV_(in) substantially equal to V_(ref), and can therefore maintain V_(in)constant or virtually grounded. A person of skill in the art wouldunderstand that in this context, equal can include deviations of up to15%. Therefore, the gain of sensing circuit 314 can be mostly a functionof the ratio of mutual capacitance 324 and the feedback impedance,comprised of resistor 312 and/or capacitor 310. The output of sensingcircuit 314 Vo can be filtered and heterodyned or homodyned by being fedinto multiplier 328, where Vo can be multiplied with local oscillator330 to produce V_(detect). V_(detect) can be inputted into filter 332.One skilled in the art will recognize that the placement of filter 332can be varied; thus, the filter can be placed after multiplier 328, asillustrated, or two filters can be employed: one before the multiplierand one after the multiplier. In some examples, there can be no filterat all. The direct current (DC) portion of V_(detect) can be used todetermine if a touch or proximity event has occurred.

Referring back to FIG. 2, in some examples, touch screen 220 can be anintegrated touch screen in which touch sensing circuit elements of thetouch sensing system can be integrated into the display pixel stack-upsof a display. The circuit elements in touch screen 220 can include, forexample, elements that can exist in LCD or other displays (LED display,OLED display, etc.), such as one or more pixel transistors (e.g., thinfilm transistors (TFTs)), gate lines, data lines, pixel electrodes andcommon electrodes. In a given display pixel, a voltage between a pixelelectrode and a common electrode can control a luminance of the displaypixel. The voltage on the pixel electrode can be supplied by a data linethrough a pixel transistor, which can be controlled by a gate line. Itis noted that circuit elements are not limited to whole circuitcomponents, such as a whole capacitor, a whole transistor, etc., but caninclude portions of circuitry, such as only one of the two plates of aparallel plate capacitor.

FIG. 4A illustrates touch screen 400 with touch electrodes 404 and 406arranged in rows and columns according to examples of the disclosure.Specifically, touch screen 400 can include a plurality of touchelectrodes 404 disposed as rows, and a plurality of touch electrodes 406disposed as columns. Touch electrodes 404 and touch electrodes 406 canbe on the same or different material layers on touch screen 400, and canintersect with each other, as illustrated in FIG. 4A. In some examples,the electrodes can be formed on opposite sides of a transparent(partially or fully) substrate and from a transparent (partially orfully) semiconductor material, such as ITO, though other materials arepossible. Electrodes displayed on layers on different sides of thesubstrate can be referred to herein as a double-sided sensor. In someexamples, touch screen 400 can sense the self-capacitance of touchelectrodes 404 and 406 to detect touch and/or proximity activity ontouch screen 400, and in some examples, touch screen 400 can sense themutual capacitance between touch electrodes 404 and 406 to detect touchand/or proximity activity on touch screen 400. Although the touchelectrodes 404 and 406 are illustrated as being rectangular-shaped, itshould be understood that other electrode shapes and structures (e.g.,diamond-, square-, stripe- or circle-shaped electrodes connected byjumpers or vias) are possible.

FIG. 4B illustrates touch screen 402 with touch node electrodes 408arranged in a pixelated touch node electrode configuration according toexamples of the disclosure. Specifically, touch screen 402 can include aplurality of individual touch node electrodes 408, each touch nodeelectrode identifying or representing a unique location on the touchscreen at which touch or proximity (i.e., a touch or proximity event) isto be sensed, and each touch node electrode being electrically isolatedfrom the other touch node electrodes in the touch screen/panel, aspreviously described. Touch node electrodes 408 can be on the same ordifferent material layers on touch screen 402. In some examples, touchscreen 402 can sense the self-capacitance of touch node electrodes 408to detect touch and/or proximity activity on touch screen 402, and insome examples, touch screen 402 can sense the mutual capacitance betweentouch node electrodes 408 to detect touch and/or proximity activity ontouch screen 402. Although touch node electrodes 408 are illustrated ashaving rectangular shapes, it should be understood that other electrodeshapes (e.g., diamonds, circles, stripes etc.) and structures arepossible.

In some examples, the touch electrodes of a touch screen can be coupledto touch circuitry (e.g., drive circuity, sense circuitry, etc.) viaconductive traces. The conductive traces can connect the touchelectrodes to a bond pad region and other connections can be used toconnect the bond pad region to the touch circuitry, for example. In someexamples, the touch electrodes can include a transparent conductivematerial, such as ITO, AZO, etc. and the conductive traces can includean opaque conductor such as copper, silver, gold, etc. In some examples,the opaque conductor can have a lower sheet resistance than thetransparent conductor. The resistance of the opaque conductive tracescan still be non-negligible in some examples. For example, differencesin lengths of the conductive traces can result in differences inresistances along the conductive traces.

In some examples, differences in the resistance of the conductive tracescoupling the touch electrodes to the sense circuitry can causeinconsistencies in the touch signals detected at different electrodes ofthe touch screen and reduce the accuracy with which touch is detectedand located. For example, inconsistencies in resistance can cause thetouch screen to less readily detect that an input device or other objectis touching the touch sensor panel in some regions of the touch sensorpanel than in other regions of the touch sensor panel. As anotherexample, inconsistencies in the resistance can cause errors in detectingthe location of the proximate object. In some examples, while a user iswriting or drawing using an input device (e.g., stylus) or their finger,errors in the determination of the location of the input device orfinger can cause the electronic device to display the drawing in a waythat does not correspond to the movement performed by the user. Forexample, the user can draw a substantially straight line with a stylusor their finger but, due to inconsistencies in the resistances of thesense connections of the touch sensor panel, the electronic device canincorrectly identify the movement of the stylus or finger as havingcurves or angles that do not correspond to the movement performed by theuser. In other words, in some examples, the lines, drawings, and/orwritings input by the user can “wobble” although the movement performedby the user was smooth.

FIG. 5 illustrates an exemplary touch screen 500 according to someexamples of the disclosure. As shown in FIG. 5, in some examples, thetouch screen 500 can include an active area 502 in which the touchelectrodes (not shown) can be disposed. The touch electrodes can includea transparent conductive material. In some examples, the touch screencan include display pixels (not shown) in the active area 502. Thus, forexample, the touch screen is able to display images and sense touchwithin active area 502. In some examples, the active area 502 can be atleast partially surrounded by a border region 504. The border region 504can include bond pads 506 a and 506 b and opaque conductive traces 508a-h, for example. In some examples, the opaque conductive traces 508a-508 h can be coupled to the touch electrodes at locations 510 a-h nearthe boundary between the active area 502 and the border region 504. Insome examples, once the electronic device including touch screen 500 isfully assembled, the border region 504 can be obscured by an opaque maskand the active area 502 can be covered with a transparent cover material(e.g., glass, plastic, etc.).

In some examples, the lengths of the opaque conductive traces 508 a-hcan vary from line-to-line in order to reach the various touchelectrodes included in the touch sensor panel 500. For example, opaqueconductive trace 508 a can be longer than opaque conductive trace 508 b.Accordingly, in some examples, the resistances of the opaque conductivetraces 508 a-h can also vary due to the variations in lengths. Forexample, the resistance of opaque conductive trace 508 a can be higherthan the resistance of conductive trace 508 b. In some examples,variations in the resistances of the opaque conductive traces 508 a-hcan cause variations in the touch signals sensed by the touch screen500. These variations can reduce the accuracy of touch detection and theaccuracy of estimated locations of objects proximate to and touching thetouch screen 500.

FIG. 6 is a chart 600 illustrating exemplary differences in touchsensing that can be caused by variations in resistances of opaqueconductive traces of touch screens according to some examples. The chart600 indicates the touch signal 604 sensed at the touch electrodes atdifferent positions 602 along one of the dimensions of the touch screen(e.g., the rows or columns). In some examples, a proximate object (e.g.,a finger or stylus) can be touching or proximate to the touch screen ata location 610 a between two sense electrodes (e.g., Sense A and SenseB). The electronic device including the touch screen can sense touchsignals 606 a and 606 b at both electrodes, in some examples.

In some examples, the resistances of the opaque conductive tracesconnecting each of the sense electrodes to touch circuitry can bedifferent. For example, the resistance of the opaque conductive tracecoupled to Sense A can be higher than the resistance of the opaqueconductive trace coupled to Sense B. Therefore, in this example,although the true position 610 a of the proximate object can be equallyspaced between the touch electrodes, the touch signal 606 a sensed fromSense A can have a lower magnitude than the touch signal 606 b sensedfrom Sense B. Thus, in some examples, when the electronic deviceestimates the position of the proximate object by calculating thecentroid of the touch signals 606 a and 606 b, the estimated position610 b can be closer to Sense B relative to the true position 610 a. Insome examples, if the user were to draw a line or drawing across thelocations of Sense A and Sense B using a digital drawing applicationusing the touch sensor panel and optionally the stylus, errors in thedetected location of the stylus could cause the displayed digitaldrawing to include curves or wobbled portions that deviate from themovement performed by the user, such as by curving closer to Sense Bthan the movement performed by the user. As another example, the touchscreen may not detect the presence of the stylus or another proximateobject, such as the user's finger when the proximate object is locatedat the location of Sense A as readily as the touch screen may detect thepresence of the proximate object when the proximate object is located atthe location of Sense B.

In some examples, if the difference in resistance between Sense A andSense B was reduced, negligible, or zero, the responses of Sense A andSense B while the proximate object is equally spaced between Sense A andSense B can be equal or substantially equal. For example, if thedifference in resistance between Sense A and Sense B was reduced,negligible, or zero, the touch signal 608 a sensed at Sense A can beequal or substantially equal to the touch signal 606 b sensed at Sense Band the electronic device can more accurately estimate the position 610a of the proximate object. In some examples, reducing the difference inresistance between Sense A and Sense B could reduce the errors insensing the movement of an object proximate to the touch screen andreduce inconsistencies and errors in determining whether a proximateobject is touching or hovering over the surface of the touch screen. Insome examples, a touch screen can include resistors along the conductivepath from the bond pads to the touch electrodes. For example, resistorswith different values can be chosen to reduce the differences inresistance between the conductive paths coupled to adjacent electrodes.

FIG. 7 illustrates an exemplary touch screen 700 including resistorscoupled to the opaque conductive traces 708 a-h that connect touchelectrodes to the bond pads 706 a-b according to some examples of thedisclosure. The touch screen 700 illustrated in FIG. 7 can be similar tothe touch screen 500 illustrated in FIG. 5. For example, touch screen700 can include an active area 702 in which the touch electrodes (notshown) can be disposed. The touch electrodes can include a transparentconductive material. In some examples, the touch screen 700 can includedisplay pixels (not shown) in the active area 702. Thus, for example,the touch screen 700 is able to display images and sense touch withinactive area 702. In some examples, the active area 702 can be surroundedby a border region 704. The border region 704 can include bond pads 706a and 706 b and opaque conductive traces 708 a-h, for example. In someexamples, the opaque conductive traces 708 a-708 h can be coupled to thetouch electrodes. In some examples, once the electronic device includingtouch screen 700 is fully assembled, the border region 704 can beobscured by an opaque mask and the active area 702 can be covered with atransparent cover material (e.g., glass, plastic, etc.). In someexamples, the transparent cover material covers the active area 702 andcovers the opaque mask disposed over the border region 704.

Similarly to touch screen 500, in some examples, the lengths of theopaque conductive traces 708 a-h of touch screen 700 can vary fromline-to-line in order to reach the various touch electrodes included inthe touch sensor panel 700. In order to reduce the variation in totalresistance of the conductive path from the bond pads 706 a-b to thetouch electrodes, touch screen 700 can further include resistors 712a-h, for example. In some examples, the resistances of resistors 712 a-hcan vary from line to line. For example, the resistor 712 a coupled toopaque conductive trace 708 a can have a higher resistance than theresistor 712 b coupled to opaque conductive trace 708 b. Because opaqueconductive trace 708 a can be longer than opaque conductive trace 712 b,the resistance of conductive trace 708 a can be higher than theresistance of opaque conductive trace 712 b, for example. In someexamples, including resistors 712 a and 712 b as illustrated in FIG. 7,wherein the resistance of resistor 712 b is greater than the resistanceof resistor 712 a, can reduce the difference in total resistance of theconductive path from bond pad 706 a to the respective touch electrodescoupled to conductive traces 708 a and 708 b.

In some examples, resistors 712 a-h can be selected such that theresistance of the conductive paths from the bond pads 706 a-b to thetouch electrodes can be equal or substantially equal (within athreshold) for all channels included in the touch screen 700. In someexamples, however, in order to make the resistance of the conductivepath of every channel of touch screen 700 equal or substantially equal,the power consumption and/or bandwidth of some channels (e.g., channelswith relatively short conductive traces, such as conductive traces 708 dand 712 e) may be unacceptable. In some examples, resistors 712 a-h canbe selected such that the difference in resistance between channelsconnecting adjacent pairs of touch electrodes is the same for alladjacent pairs of touch electrodes. Selecting resistors 712 a-h toequalize the change in resistance for all adjacent pairs of touchelectrodes can reduce the resistance needed for one or more channels ofthe touch screen 700, thereby improving bandwidth while also improvingthe accuracy of touch detection compared to the accuracy of touchdetection of a touch screen without resistors 712 a-h (e.g., touchscreen 500).

As shown in FIG. 7, in some examples, the resistors 712 a-h can bedisposed in the border region 704 of the touch screen 700. Resistors 712a-h can include a transparent conductive material (e.g., ITO) that canbe the same material or a different material from the transparentconductive material included in the touch electrodes of the touch screen700. In some examples, the transparent conductive material of the touchelectrodes is the same as the transparent conductive material of theresistors and the resistors are a part of each touch electrode. In someexamples, the transparent conductive material can have a higher sheetresistance than the opaque conductive material (e.g., the materialincluded in opaque conductive traces 708 a-h). Thus, for example,resistors that include the transparent conductive material can have asmaller surface area and/or higher resistance than the resistors thatinclude the opaque conductive material. As will be described in moredetail below with reference to FIGS. 8A-9, in some examples, resistors712 a-h can have the same footprint or outer dimensions as one anotherand can be patterned in different ways such that the resistances of thevarious resistors 712 a-h can be different from one another.

FIGS. 8A-8B illustrate an exemplary resistor 800 according to someexamples of the disclosure. In some examples, resistor 800 can becoupled between a touch electrode 802 and an opaque conductive trace808, for example. In some examples, the touch electrode 802 can besimilar to any of the touch electrodes disclosed herein and opaqueconductive trace 808 can be similar to the opaque conductive traces 508a-h and/or 708 a-h described above with reference to FIG. 5 and FIG. 7,respectively. FIGS. 8A and 8B illustrate similar resistors 800 anddifferent touch electrodes 802 and 802 a-c.

In some examples, resistor 800 can include a transparent conductivematerial (e.g., ITO) that can be the same as or different from atransparent conductive material included in the touch electrode 802 towhich the resistor 800 is coupled. The resistor 800 and opaqueconductive trace 808 can be disposed in the border region 812 of a touchscreen and the touch electrode 802 can be disposed in an active area 810of the touch screen, for example.

In some examples, the resistor 800 can include three connected segments804 a-c. In some examples, the resistor 800 can include a differentnumber of segments, such as one segment, two segments, or four or moresegments. Each segment 804 a-c can have a rectangular shape and arectangular hole 806 a-c, for example. In some examples, the segments804 a-c can include different outer shapes and/or different shaped holes(or multiple holes), such as outer shapes and/or holes shaped likesquares, circles, triangles, polygons, etc. As shown in FIG. 8A, in someexamples, each segment 804 a-c of resistor 800 has the same shape anorientation. In some examples, the shape(s) and/or orientation(s) of thesegments 804 a-c of resistor 800 can be varied. Each segment 804 a-cincluded in resistor 800 can have the same dimensions, including thesame outer dimensions 816 and 814 and/or the same dimensions of theholes 806 a-c, including inner dimensions 818 and 820, for example.Moreover, in some examples, the distance 822 between a respective part(e.g., the top) of each portion 804 a-c of the resistor 800 and theconductive trace 808 can be the same for all segments 804 a-c ofresistor 800 and all resistors included in the panel. Moreover, in someexamples, the distance between the touch electrode 802 and conductivetrace 808 can be the same as the distance between the other touchelectrodes and their respective conductive traces. In some examples, thedimensions 818 and 820 of the holes 806 a-c can vary among the segments806 a-c of resistor 800. In some examples, the outer dimensions 814 and816 of the segments 804 a-c of resistor 800 can vary.

As shown in FIG. 8A, in some examples, the touch electrode 802 caninclude a continuous pattern that is coupled to each segment 804 a-c ofthe resistor. As shown in FIG. 8B, in some examples, the touch electrodecan include three patterned segments 802 a-c. In some examples, thetouch electrodes can have a different number of patterned segments, suchas two segments or four or more segments. As shown in FIG. 8B, in someexamples, each touch electrode segment 802 a-c can be coupled to aresistor segment 804 a-c. The touch electrode segments 802 a-c can beconnected through resistor 800 and otherwise completely separated fromeach other, for example. In some examples, the segments 802 a-c can becoupled at locations within the active area 810 of the touch sensorpanel. In some examples, the touch electrodes can include patterns thatare different from the patterns illustrated in FIGS. 8A-8B withoutdeparting from the scope of the disclosure.

As described above with reference to FIGS. 6-7, in some examples, theresistors included in the touch screen can have different resistancesfrom line to line in order to reduce the differences in resistances fromline to line. In some examples, the resistance of resistors 800 can bealtered by changing the inner dimensions 818 and 820 of the holes 806a-c of segments 804 a-c and/or changing the width of the connection ofthe resistors to the touch electrodes 802 or 802 a-c and/or the width ofthe connections to the opaque conductive trace 808, as will be describedin more detail below with reference to FIG. 9.

FIG. 9 illustrates exemplary resistors 900, 920, and 940 according tosome examples of the disclosure. Resistors 900, 920, and/or 940 can beincluded in a touch sensor panel, such as touch sensor panel 700described above with reference to FIG. 7. As previously described, oneor more dimensions of the resistors included in a touch sensor panel canvary from line to line in order to provide resistors with differentresistances to reduce the variation in the total resistance of each linein the touch sensor panel.

In some examples, the dimensions of the holes of the segments of theresistors can vary from resistor to resistor. For example, the holes 906of the segments 902 a-c of resistor 900 can be larger than the holes 926of the segments 922 a-c of resistor 920. For example, the length 908 andheight 910 of holes 906 of the segments 902 a-c of the resistor 900 canbe larger than the length 928 and height 930 of the holes 926 of thesegments 922 a-c of resistor 920. As a result, the resistance ofresistor 900 can be greater than the resistance of resistor 920, forexample, because the conductive pathways of resistor 900 can be narrowerthan the conductive pathways of resistor 920. In some examples, thelength, or the height, or both the length and the height of the holes ofthe segments of the resistors can be varied from resistor to resistor toadjust the resistances of the resistors.

In some examples, the width of the connections of the resistors to thetouch electrode and/or the opaque conductive traces can vary fromresistor to resistor. For example, the width 904 of the connections ofresistor 900 can be wider than the width 944 of the connections ofresistor 940. In some examples, resistor 900 has a lower resistance thanresistor 940 because the width 904 of the connections of resistor 900can be wider than the width 944 of the connections of resistor 940. Insome examples, both the width of the connections of the resistors andthe size of the holes of the segments of the resistors can be varied toadjust the resistances of the resistors.

In some examples, although the resistors can have different connectionwidths and/or different sized holes, the outer dimensions of thesegments of the resistors and the spaces between the segments of eachresistor can be the same (or within a threshold of the same) for all ofthe resistors in the touch sensor panel. For example, the length 912 ofthe segments 902 a-c of resistor 900, the length 932 of the segments 922a-c of resistor 920, and the length 952 of the segments 942 a-c ofresistor 940 can all be equal, substantially equal, or within athreshold of equal. As another example, the height 914 of the segments902 a-c of the resistor 900, the height 934 of the segments 922 a-c ofresistor 920, and the height 954 of the segments 942 a-c of resistor 940can all be equal, substantially equal, or within a threshold of equal.As another example, the distance 916 between the segments 902 a-c ofresistor 900, the distance 936 between the segments 922 a-c of resistor920, and the distance 956 between the segments 942 a-c of resistor 940can all be equal, substantially equal, or within a threshold of equal.Moreover, the distances between adjacent resistors can all be equal,substantially equal, or within a threshold of equal for all adjacentpairs of resistors included in the touch screen, for example. In someexamples, the distances between adjacent resistors can be the same as ordifferent from the distances (e.g., 916, 936, 956) between segments ofeach resistor. Additionally, in some examples, the distances (e.g., 918,938, and 958) from a respective reference point (e.g., the top edge) ofeach resistor 900, 920, and 940 and the respective conductive traces towhich each resistor is coupled can be the same, substantially the same,or within a threshold distance of the same. Moreover, in some examples,the distances between the respective touch electrodes coupled to eachresistor 800, 820, and 840 and the respective conductive traces coupledto each resistor can be the same, substantially the same, or within athreshold of the same.

In some examples, the segments of each resistor to have the same orsubstantially the same (e.g., within a threshold) outer dimensionswithin each respective resistor and/or across all of the resistors in asingle touch screen. If all of the resistors have outer dimensions thatare equal, substantially equal, or within a threshold of equal, visualartifacts at the edge of the active area caused by the resistors can beless noticeable to the user and/or reduced, for example. In someexample, if all of the resistors have outer dimensions that are equal,substantially equal, or within a threshold of equal, a laminated layerapplied on top of the resistors in the touch screen can have aconsistent, smooth, substantially smooth, or otherwise desired texture.In some examples, the spacing between the segments of a respectiveresistor and/or the spacing between each pair of adjacent resistors canbe at least a minimum size and/or the holes of the segments of theresistors can each be a minimum size in order to facilitate laminationof the layer on top of the resistors.

It should be understood that the resistors of the touch screen candiffer from the examples illustrated herein without departing from thescope of the disclosure. For example, rather than beingrectangle-shaped, the resistors can have a different shape, such assquare, circle, triangle, oval, or another shape. In some examples,additional elements can be disposed on the same material layer as theresistors, such as dummy electrodes, which can be disposed outside ofthe segments of the resistors or within the holes of the segments of theresistors. Moreover, in some examples, the resistor segments do notinclude holes. For example, the resistors and/or resistor segments canbe serpentine-shaped and the number of turns, lengths, and/or widths ofthe conductive material of the resistors and/or resistor segments canvary from resistor to resistor to adjust the resistance of eachresistor. As another example, the resistors or resistor segments caninclude two or more holes instead of one hole.

Therefore, according to the above, in some examples, an electronicdevice includes a plurality of touch electrodes including a firsttransparent conductive material, the touch electrodes disposed in anactive area of a touch screen of the electronic device, wherein theactive area includes a plurality of display pixels of the touch screen;a plurality of conductive traces including an opaque conductivematerial, the plurality of conductive traces coupled to a touchcircuitry of the electronic device and disposed in a border region ofthe electronic device, the border region distinct from the active area;a plurality of resistors coupled between the plurality of touchelectrodes and conductive traces, the resistors including a secondtransparent conductive material, the resistors disposed in the borderregion of the electronic device, each of the resistors having a samelength and a same width, wherein: the plurality of resistors includes afirst resistor and a second resistor, the first resistor has a firstpattern and a first resistance, and the second resistor has a secondpattern different from the first pattern and a second resistancedifferent from the first resistance. Additionally or alternatively, insome examples, the first pattern of the first resistor includes a firstarea not including the second transparent conductive material of thefirst resistor surrounded by the second transparent conductive materialof the first resistor. Additionally or alternatively, in some examples,the second pattern of the second resistor includes a second area notincluding the second transparent conductive material of the secondresistor surrounded by the second transparent conductive material of thesecond resistor, wherein the second area has a different dimension thana dimension of the first area. Additionally or alternatively, in someexamples, the first resistor includes a plurality of electricallycoupled patterned resistor segments, and each of the plurality ofresistor segments of the first resistor has a same pattern. Additionallyor alternatively, in some examples, the plurality of resistor segmentsof the first resistor includes a first resistor segment, the firstresistor segment including a first area not including the secondtransparent conductive material of the first resistor surrounded by thesecond transparent conductive material of the first resistor, theplurality of resistor segments of the first resistor includes a secondresistor segment, the first resistor segment including a second area notincluding the second transparent conductive material of the firstresistor surrounded by the second transparent conductive material of thefirst resistor, and dimensions of the first area and second area are thesame. Additionally or alternatively, in some examples, a distancebetween each of the plurality of segments of the first resistor is thesame as a distance between the first resistor and the second resistor.Additionally or alternatively, in some examples, the electronic deviceincludes an opaque mask disposed in the border region, wherein theopaque mask obscures the plurality of conductive traces and at least aportion of the plurality of resistors. Additionally or alternatively, insome examples, the first resistor is coupled to a first touch electrodeand a first conductive trace, the first touch electrode and the firstconductive trace being a first distance apart, and the second resistoris coupled to a second touch electrode and second conductive trace, thesecond touch electrode and the second conductive trace being the firstdistance apart. Additionally or alternatively, in some examples, thefirst resistor is coupled to a first conductive trace of the pluralityof conductive traces, the first conductive trace having a thirdresistance, the second resistor is coupled to a second conductive traceof the plurality of conductive traces, the second conductive tracehaving a fourth resistance, the first resistance is greater than thesecond resistance, and the fourth resistance is greater than the thirdresistance. Additionally or alternatively, in some examples, adifference between the third resistance and fourth resistance is greaterthan a difference between a respective combined resistance of the firstresistance and the third resistance and a respective combined resistanceof the second resistance and fourth resistance. Additionally oralternatively, in some examples, the electronic device further includesa bond pad disposed in the border region of the electronic device,wherein the conductive traces are coupled to the touch circuitry via thebond pad, and a distance between the bond pad and the first resistor anda distance between the bond pad and the second resistor are different,wherein: the distance between the bond pad and the first resistor isless than the distance between the bond pad and the second resistor, andthe first resistance is greater than the second resistance.

Some examples of the disclosure are directed to electronic device,comprising: a plurality of touch electrodes including a transparentconductive material, the touch electrodes including first portionsdisposed in an active area of a touch screen of the electronic device,wherein the active area includes a plurality of display pixels of thetouch screen; a plurality of conductive traces including an opaqueconductive material, the plurality of conductive traces coupled to atouch circuitry of the electronic device and disposed in a border regionof the electronic device, the border region distinct from the activearea, the plurality of conductive traces coupled to the plurality oftouch electrodes, wherein the plurality of touch electrodes includesecond portions disposed in the border region of the electronic device,each second portion of the resistors having a same length and a samewidth, a second portion of a first touch electrode has a first patternand the first touch electrode has a first resistance, and a secondportion of a second touch electrode has a second pattern different fromthe first pattern and the second touch electrode has a second resistancedifferent from the first resistance. Additionally or alternatively, insome examples, the first pattern of the first touch electrode includes afirst area not including the transparent conductive material of thefirst touch electrode surrounded by the transparent conductive materialof the first touch electrode. Additionally or alternatively, in someexamples, the second pattern of the second touch electrode includes asecond area not including the transparent conductive material of thesecond touch electrode surrounded by the transparent conductive materialof the second touch electrode, wherein the second area has a differentdimension than a dimension of the first area. Additionally oralternatively, in some examples, the first touch electrodes includes aplurality of electrically coupled patterned segments, and each of theplurality of segments of the first touch electrode has a same pattern.Additionally or alternatively, in some examples, the plurality ofsegments of the first touch electrode includes a first segment, thefirst segment including a first area not including the transparentconductive material of the first touch electrode surrounded by thetransparent conductive material of the first touch electrode, theplurality of segments of the first touch electrode includes a secondsegment, the first segment including a second area not including thetransparent conductive material of the first touch electrode surroundedby the transparent conductive material of the first touch electrode, anddimensions of the first area and second area are the same. Additionallyor alternatively, in some examples, the electronic device furtherincludes an opaque mask disposed in the border region, wherein theopaque mask obscures the plurality of conductive traces and at least aportion of the second portions of the plurality of touch electrodes.Additionally or alternatively, in some examples, the first touchelectrode is coupled to a first conductive trace of the plurality ofconductive traces, the first conductive trace having a third resistance,the second touch electrode is coupled to a second conductive trace ofthe plurality of conductive traces, the second conductive trace having afourth resistance, the first resistance is greater than the secondresistance, and the fourth resistance is greater than the thirdresistance. Additionally or alternatively, in some examples, adifference between the third resistance and fourth resistance is greaterthan a difference between a respective combined resistance of the firstresistance and the third resistance and a respective combined resistanceof the second resistance and fourth resistance. Additionally oralternatively, in some examples, the electronic device further includesa bond pad disposed in the border region of the electronic device,wherein the conductive traces are coupled to the touch circuitry via thebond pad, and a distance between the bond pad and the first touchelectrode and a distance between the bond pad and the second touchelectrode are different, wherein: the distance between the bond pad andthe first touch electrode is less than the distance between the bond padand the second touch electrode, and the first resistance is greater thanthe second resistance.

Although the disclosed examples have been fully described with referenceto the accompanying drawings, it is to be noted that various changes andmodifications will become apparent to those skilled in the art. Suchchanges and modifications are to be understood as being included withinthe scope of the disclosed examples as defined by the appended claims.

1. An electronic device, comprising: a plurality of touch electrodesincluding a first transparent conductive material, the touch electrodesdisposed in an active area of a touch screen of the electronic device,wherein the active area includes a plurality of display pixels of thetouch screen; a plurality of conductive traces including an opaqueconductive material, the plurality of conductive traces coupled to atouch circuitry of the electronic device and disposed in a border regionof the electronic device, the border region distinct from the activearea; a plurality of resistors coupled between the plurality of touchelectrodes and conductive traces, the resistors including a secondtransparent conductive material, the resistors disposed in the borderregion of the electronic device, each of the resistors having a samelength and a same width, wherein: the plurality of resistors includes afirst resistor and a second resistor, the first resistor has a firstpattern and a first resistance, wherein the first pattern of the firstresistor includes a first area not including the second transparentconductive material of the first resistor surrounded by the secondtransparent conductive material of the first resistor, and the secondresistor has a second pattern different from the first pattern and asecond resistance different from the first resistance.
 2. (canceled) 3.The electronic device of claim 1, wherein the second pattern of thesecond resistor includes a second area not including the secondtransparent conductive material of the second resistor surrounded by thesecond transparent conductive material of the second resistor, whereinthe second area has a different dimension than a dimension of the firstarea.
 4. The electronic device of claim 1, wherein: the first resistorincludes a plurality of electrically coupled patterned resistorsegments, and each of the plurality of resistor segments of the firstresistor has a same pattern.
 5. The electronic device of claim 4,wherein: the plurality of resistor segments of the first resistorincludes a first resistor segment, the first resistor segment includinga first area not including the second transparent conductive material ofthe first resistor surrounded by the second transparent conductivematerial of the first resistor, the plurality of resistor segments ofthe first resistor includes a second resistor segment, the firstresistor segment including a second area not including the secondtransparent conductive material of the first resistor surrounded by thesecond transparent conductive material of the first resistor, anddimensions of the first area and second area are the same.
 6. Theelectronic device of claim 4, wherein a distance between each of theplurality of segments of the first resistor is the same as a distancebetween the first resistor and the second resistor.
 7. The electronicdevice of claim 1, further comprising an opaque mask disposed in theborder region, wherein the opaque mask obscures the plurality ofconductive traces and at least a portion of the plurality of resistors.8. The electronic device of claim 1, wherein: the first resistor iscoupled to a first touch electrode and a first conductive trace, thefirst touch electrode and the first conductive trace being a firstdistance apart, and the second resistor is coupled to a second touchelectrode and second conductive trace, the second touch electrode andthe second conductive trace being the first distance apart.
 9. Theelectronic device of claim 1, wherein: the first resistor is coupled toa first conductive trace of the plurality of conductive traces, thefirst conductive trace having a third resistance, the second resistor iscoupled to a second conductive trace of the plurality of conductivetraces, the second conductive trace having a fourth resistance, thefirst resistance is greater than the second resistance, and the fourthresistance is greater than the third resistance.
 10. The electronicdevice of claim 9, wherein a difference between the third resistance andfourth resistance is greater than a difference between a respectivecombined resistance of the first resistance and the third resistance anda respective combined resistance of the second resistance and fourthresistance.
 11. The electronic device of claim 1, further comprising: abond pad disposed in the border region of the electronic device, whereinthe conductive traces are coupled to the touch circuitry via the bondpad, and a distance between the bond pad and the first resistor and adistance between the bond pad and the second resistor are different,wherein: the distance between the bond pad and the first resistor isless than the distance between the bond pad and the second resistor, andthe first resistance is greater than the second resistance.
 12. Anelectronic device, comprising: a plurality of touch electrodes includinga transparent conductive material, the touch electrodes including firstportions disposed in an active area of a touch screen of the electronicdevice, wherein the active area includes a plurality of display pixelsof the touch screen; a plurality of conductive traces including anopaque conductive material, the plurality of conductive traces coupledto a touch circuitry of the electronic device and disposed in a borderregion of the electronic device, the border region distinct from theactive area, the plurality of conductive traces coupled to the pluralityof touch electrodes, wherein: the plurality of touch electrodes includesecond portions disposed in the border region of the electronic device,each second portion of the plurality of touch electrodes having a samelength and a same width, a second portion of a first touch electrode hasa first pattern and the first touch electrode has a first resistance,wherein the first pattern of the first touch electrode includes a firstarea not including the transparent conductive material of the firsttouch electrode surrounded by the transparent conductive material of thefirst touch electrode, and a second portion of a second touch electrodehas a second pattern different from the first pattern and the secondtouch electrode has a second resistance different from the firstresistance.
 13. (canceled)
 14. The electronic device of claim 12,wherein the second pattern of the second touch electrode includes asecond area not including the transparent conductive material of thesecond touch electrode surrounded by the transparent conductive materialof the second touch electrode, wherein the second area has a differentdimension than a dimension of the first area.
 15. The electronic deviceof claim 12, wherein: the first touch electrodes includes a plurality ofelectrically coupled patterned segments, and each of the plurality ofsegments of the first touch electrode has a same pattern.
 16. Theelectronic device of claim 15, wherein: the plurality of segments of thefirst touch electrode includes a first segment, the first segmentincluding a first area not including the transparent conductive materialof the first touch electrode surrounded by the transparent conductivematerial of the first touch electrode, the plurality of segments of thefirst touch electrode includes a second segment, the first segmentincluding a second area not including the transparent conductivematerial of the first touch electrode surrounded by the transparentconductive material of the first touch electrode, and dimensions of thefirst area and second area are the same.
 17. The electronic device ofclaim 12, further comprising an opaque mask disposed in the borderregion, wherein the opaque mask obscures the plurality of conductivetraces and at least a portion of the second portions of the plurality oftouch electrodes.
 18. The electronic device of claim 12, wherein: thefirst touch electrode is coupled to a first conductive trace of theplurality of conductive traces, the first conductive trace having athird resistance, the second touch electrode is coupled to a secondconductive trace of the plurality of conductive traces, the secondconductive trace having a fourth resistance, the first resistance isgreater than the second resistance, and the fourth resistance is greaterthan the third resistance.
 19. The electronic device of claim 18,wherein a difference between the third resistance and fourth resistanceis greater than a difference between a respective combined resistance ofthe first resistance and the third resistance and a respective combinedresistance of the second resistance and fourth resistance.
 20. Theelectronic device of claim 12, further comprising: a bond pad disposedin the border region of the electronic device, wherein the conductivetraces are coupled to the touch circuitry via the bond pad, and adistance between the bond pad and the first touch electrode and adistance between the bond pad and the second touch electrode aredifferent, wherein: the distance between the bond pad and the firsttouch electrode is less than the distance between the bond pad and thesecond touch electrode, and the first resistance is greater than thesecond resistance.